冗余其实是一个很宽泛的技术概念,而不是大家理解中的技术方法,冗余原始概念是重复配置系统的一些部件,当系统发生故障时,冗余配置的部件介入并承担故障部件的工作,由此减少系统的故障时间。冗余按类型分为主动和被动形式,所谓主动和被动主要是主从切换的能动性上来分析,主动冗余是可以主动切换,就是可以随时自行切换;被动冗余是指当正在 Redundancy is actually a very broad technical concept, not a technical method that everyone understands. The original concept of redundancy is to repeat the configuration of some parts of the system. When the system breaks down, the redundantly configured parts intervene and take over the work of the failed parts , Thereby reducing system downtime. Redundancy by type is divided into active and passive forms, the so-called active and passive mainly from the initiative to switch from the analysis of the initiative to take the initiative to switch can be active, that is, can switch at any time; passive redundancy refers to being